Oscillatable die machine for stamping work pieces



May 17, 1960 A. BAUER 2, 3 ,7

OSCILLATABLE DIE MACHINE FOR STAMPING WORK PIECES Filed Feb. 5, 1957 2 Sheets-Sheet 1 INVENTOR ATTORNEY May 17, 1960 A. BAUER 2,936,700

OSCILLATABLE DIE MACHINE FOR STAMPING WORK PIECES Filed Febw 5, 1957 2 Sheets-Sheet 2 ATTOIM/[Y DIE MACHINE WORK PIECES Alfred Bauer, Le Locle, Switzerland Application FebruaryS, 1957, Serial No. 638,389

Claims priority, application Switzerland February 23, 1956 6 Claim. (Cl. 101-5) OSCILLATABLE For: STAMPING The present invention relates to a work-stamping apparatus and has for object the stamping of work by means of an oscillatable die which produces a rolling-stamping action.

This apparatus is characterized by the feature that the die besides having this oscillatory movement undergoes a backward and forward movement having a component ice A rotation of the circular piece 52 thus occurs about axis 66 of the latter piece which produces the rollingstamping action on member '67 that is accordingly stamped, as for exampleto the type for a typewriter. This member 67 is tightly held in position by any suitable means during stamping, the details of which means are of no present immediate concern.

In the conventional stamping machines, the bracket of the rotatable die is slidingly mounted on the frame of the machine and is moved perpendicularly to the direction of the stamping so that this displacement has no component parallel to the direction of stamping.

In the present machine, on the contrary, the bracket 46 is oscillatably mounted on the frame of the machine, so that the axis 66, during the oscillatory movements of the bracket, follow along an arc of cylinder 69 (Fig. 2).

1 Since the direction of stamping, designated by 68, is

parallel to the direction of the stamping,'so as-to remove scraps or the like which may accumulatebetween the die and the stamped member.

The die is mounted rotatably on a bracket that is oscillatably on the frame of the machine and the bracket is submitted to the action of a control mechanism urging it to move oscillatably, the axis of rotation of the die being parallel to the axis of oscillation of the bracket and both axes being perpendicular to the direction of stamping,

The annexed drawing illustrates, by way of example, an embodiment of the invention. 6

Fig. 1 is a sectional view, along line I-I of Fig. 2, of a part of a machine designed for stamping and thus forming type of typewriters.

Fig. 2 is a profile view, with a partial section along line 11-11 of Fig. l, of this machine.

Fig. 3 is a sectional view along line III -III of Fig. 1.

Fig. 4 is a sectional view along line IV--IV of Fig. 3.

The machine represented comprises a frame 44 on which is rotatably mounted a shaft 45 carrying an oscillatable bracket 46. The oscillatory movements of this bracket are produced by a crank 47 (Fig. 2) connected to the bracket by a rod 48 hingedly secured to a lug 46a of the bracket. When the crank 47 is rotating, driven by the non represented motor of the machine, the bracket 46 is thus submitted to an oscillating movement (indicated by the arrow 49) around the axis 50 of the shaft 45.

The bracket 46 carries, rotatably mounted thereon, a shaft 51 (Fig. 1) to which is secured a circular piece 52 provided with at least a die 53. This circular piece is removably mounted on the extremity of the shaft 51; it is held in place by a screw 54 and a brace 55 which have to be removed for allowing the circular piece 52 to be removed. The shaft 51 carries, rigidly secured thereon, a sleeve or drum 56 on which are wound the extremities of three flexible metal strips 57, 58 and 59. These strips are secured to the sleeve 56 by means of a tightening clamp 60 (see Fig. 3) pressed against the sleeve by screws 61. The strips 58 and 59 are situated on opposite sides of the central strip 57; they are wound in one sense while the strip 57 is wound in the opposite sense. At the other ends, two of the strips are secured at 62, and the third strip at 63, to a frame 64 (Fig. 3) carried by the frame 44 of the machine. A tensioning device 65 allows the strips to be tightened so that their portions which are not wound are situated substantially in a common plane tangential to the sleeve 56.

These flexible strips constitute a connecting mechanism urging the shaft 51 to rotate on its axis when the bracket 46 oscillates as represented by the arrow 49.

perpendicular to the oscillation axis 50 of the bracket 46, it followsthat the displacement of the axis 66, parallel to the axis 50, introduces a component a parallel to the direction 68 of the stamping; it is to be noted that the maximum value of this component is smaller than the distance a indicated in the drawing (Fig. 2) since the amplitude of the oscillation of the bracket 46 has been exaggerated for purpose of a better understanding.

This component w of the backward and forward movement of thedie improves the quality of the rolling-stamping obtained by the oscillatable rotation of the die, for such reasons as removing automatically any scraps which are produced by the stamping between the die and the stamped member.

The stamped member has a sharpness of the stamped indicia which cannot be reached by the conventional rolling-stamping processes or machines.

It is to be noted that the position of the frame 64 on the machine is adjustable, by means of an adjusting device 70 (Fig. 3) so that the initial angular position of the circular piece 52 is adjustable too. Securing screws 71, which pass through elongated holes 72 of the frame 64, first are backed off when the position of the frame is to be adjusted.

What I claim is:

1. In a work-stamping machine, a frame, a bracket oscillatably mounted on said frame, means for imparting oscillatory movement to said bracket, a work-stamping die rotatably mounted on said bracket, the axes of rotation of the die and of the bracket being spaced and parallel to each other and perpendicular to the direction of, stamping, and means producing rotation of said die in alternately reversing directions on said axis of rotation of the die during the oscillatory movement of the bracket, whereby the die in moving with said bracket exerts rotary action on the work and exerts increasing and then decreasing components of force on the work parallel to the direction of stamping.

2. In a work-stamping machine, a frame, a bracket oscillatably mounted on said frame, means for imparting oscillatory movement to said bracket, a work-stamping die rotatably mounted on said bracket, the axes of rotation of the die and of the bracket being spaced and parallel to each other and perpendicular to the direction of stamping, a drum rotatable with said die, and at least two flexible members one extremity of each of which is wound around said drum and secured thereto and the other extremity of each of which is secured to said frame, said members being wound in opposite senses on said drum in such way that the translation of the die due to the oscillatory movements of the bracket produce rotation of the die in alternately reversing directions on the axis of said die, whereby the die in. moving with said bracket exerts a rotary action on the work and exerts increasing and then decreasing components of r 3 force on the work parallel to the direction of stamping 3. A work-stamping machine in accordance with claim 2, in which portions of said flexible members between aitli. drum. and frame e uat d: n a ommon, plane Ear llel pi eax fot otati q r a ddie. 1

i In. rt r tampin machin a, frame, a. bracket os cillatably mounted on said frame, means for-impart; ingoseillatoty; movement to .-said-bracket, a,worl cfstarnging die rotatablymountedon said bracket, theaxesof,rlo,ta,- tion of the die and of the bracket being spaced and parallelto each other and perpendicular to; the direction ofstamping, a flexible member one extremity; of which is wound: around: said drum and secured, to saiddrum and the; other, extremity of, which is secured to said frame, and two flexible members situated-on opposite sides of, said first member, one extremity, of each of which'said two members being woundaround said drum m mos in the opposite sense to the windingsenseof, the; first said member while the other extremity-of each of said members is secured to said frame, the whole, in such-way that the translation of the die due to the oscillatory-movements ofthe bracket produce rotation of the die in alernately reversing directions on the axis. of; the die, whereby the die in moving with said bracket. exerts a rotary action on the work and exerts increasing andthen decreasing components of force on the work; parallel to the direction of stamping.

5. In a work stamping machine, a frame, abracket oscillatably. mounted on said frame, meansefor impartingpscillatory movement to said bracket, a work-stamping die rotatably mounted on said bracket, the axes of rotation of the die and of the bracket being spacedand parallel toeach other and perpendicular't-othe direction of stamping, a drum rotatable with said die, a.support adjustably mounted on said frame and' movable with respect to-said die, and at least two flexible members, one extremity of each ofv which is'wound around said drum and secured to said drum and the other extremity of each ofwhich is secured to said support, said membersbeing wound in an opposite sense on said drum in such way that the translation of the die due to the oscillatory movements of the bracket produce rotation of the die in alernately reversing directions on the axis of said die, whereby the die in moving with said bracket exerts a rotary action on the work and exerts increasing and then decreasing components of force-on the work parallel to the-,diregtion;ofigstamping 6. In a work-stamping, machine;. a frame, a bracket mounted on said frame and having anaxis for oscillating relative to said'f'rame, a rodhingedly secured to said bracket, acrank, operatively conneetedto'said rod for oscillating said bracket about said axis of oscillation, a die rotatably mountedonv said'bracket, themes of rotation of the die and of the bracket being spaced and parallel to each other and perpendicular to the direction of stamping, and means producing driven rotation of said die in alternately reversing directions on said axis of rotation Qfthe die during the oscillatory movement of the braekegfwhereby the die in moving with said bracket exerts a rotary action on the work andexerts increasing andthfin, decreasing components of force on the work parallelto the direction of, stamping.

ReferencesCitedin the file of this patent UNITED STATES PATENTS 

